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Stock-based Compensation | 3 Months Ended
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Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation | Stock-based Compensation General The Company grants certain stock-based compensation awards, including restricted stock awards, restricted stock units and performance share awards. Stock-based compensation expense associated with these awards was $15.1 million and $5.4 million in the first quarter of 2019 and 2018, respectively. Stock-based compensation expense is included in general and administrative expense in the Condensed Consolidated Statement of Operations. For the first quarter of 2019, the Company recorded a decrease to tax expense of $1.1 million as a result of federal and state tax deductions exceeding the book compensation expense for employee stock-based compensation awards that vested during the period. For the first quarter of 2018, the Company recorded an increase to tax expense of $0.2 million as a result of book compensation expense exceeding the federal and state tax deductions for employee stock-based compensation awards that vested during the period. Refer to Note 13 of the Notes to the Consolidated Financial Statements in the Form 10-K for further description of the various types of stock-based compensation awards and the applicable award terms. Restricted Stock Units During the first three months of 2019, 76,232 restricted stock units were granted to non-employee directors of the Company with a weighted-average grant date value of $24.95 per unit. The fair value of these units is measured based on the closing stock price on grant date and compensation expense is recorded immediately. These units immediately vest and are issued when the director ceases to be a director of the Company. Performance Share Awards The performance period for the awards granted during the first three months of 2019 commenced on January 1, 2019 and ends on December 31, 2021. The Company used an annual forfeiture rate assumption ranging from zero percent to five percent for purposes of recognizing stock-based compensation expense for its performance share awards. Performance Share Awards Based on Internal Performance Metrics The fair value of performance share award grants based on internal performance metrics is based on the closing stock price on the grant date. Each performance share award represents the right to receive up to 100% of the award in shares of common stock. Based on the Company’s probability assessment at March 31, 2019, it is considered probable that the criteria for all performance awards based on internal metrics awards will be met. Employee Performance Share Awards. During the first three months of 2019, 526,730 Employee Performance Share Awards were granted at a grant date value of $24.95 per share. The performance metrics are set by the Company’s compensation committee and are based on the Company’s average production, average finding costs and average reserve replacement over a three-year performance period. Hybrid Performance Share Awards. During the first three months of 2019, 315,029 Hybrid Performance Share Awards were granted at a grant date value of $24.95 per share. The 2019 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary, provided that the Company has $100 million or more of operating cash flow for the year preceding the vesting date, as set by the Company’s compensation committee. If the Company does not meet the performance metric for the applicable period, then the portion of the performance shares that would have been issued on that anniversary date will be forfeited. Performance Share Awards Based on Market Conditions These awards have both an equity and liability component, with the right to receive up to the first 100% of the award in shares of common stock and the right to receive up to an additional 100% of the value of the award in excess of the equity component in cash. The equity portion of these awards is valued on the grant date and is not marked to market, while the liability portion of the awards is valued as of the end of each reporting period on a mark-to-market basis. The Company calculates the fair value of the equity and liability portions of the awards using a Monte Carlo simulation model. TSR Performance Share Awards. During the first three months of 2019, 536,673 TSR Performance Share Awards were granted and are earned, or not earned, based on the comparative performance of the Company’s common stock measured against a predetermined group of companies in the Company’s peer group over a three-year performance period. The following assumptions were used to determine the grant date fair value of the equity component (February 19, 2019) and the period-end fair value of the liability component of the TSR Performance Share Awards:
|  | Grant Date |  | March 31, 2019
Fair value per performance share award |  | $ | 20.63 |  |  | $11.95 - $24.11
Assumptions: |  |  |  |  |
Stock price volatility |  | 31.3 | % |  | 28.4%-31.8%
Risk free rate of return |  | 2.46 | % |  | 2.21% - 2.41%

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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